My admin account lacks permission to make changes

Your article was great in helping me find the replacement files, the only problem is that I cannot replace the originals as it says I do not have permission, even though I am an administrator - examining the File's properties / security, I find that three users are listed, System, myself and an "Account unknown" with a huge number sequence, This unknown user and System has full permissions whereas I have only 'read' and 'read and execute' when I try and edit permissions, they are all shown greyed out, indicating that I am unable to change them If I try and replace, rename etc one of these files, I am told that I need permission from this unknown user (plus huge number sequence) How can I over-ride or delete this unknown user?
 
A screen shot would help.
Is this example what you are seeing ?
If not provide the exact name & location of the file in question please.
screenshot_27.jpg
 
Every Windows system as a special built-in Administrator account, the SID is:
S-1-5-21-635012957-3435899091-545158274-500

Get a command prompt and enter
  • wmic useraccount
 
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